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首页> 外文期刊>Polymers for advanced technologies >EMI shielding and microwave absorption behavior of Au-MWCNT/polyaniline nanocomposites
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EMI shielding and microwave absorption behavior of Au-MWCNT/polyaniline nanocomposites

机译：Au-MWCNT /聚苯胺纳米复合材料的EMI屏蔽和微波吸收行为

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摘要

Electrically conducting Au-multiwalled carbon nanotube/polyaniline (Au-MWCNT/PANi) nanocomposites were synthesized by two different ways: (1) by direct mixing of MWCNT/PANi and Au nanoparticles (Au-MWCNT/PANi-1) and (2) by in situ polymerization of aniline in the presence of both MWCNTs and Au nanoparticles (Au-MWCNT/PANi-2). The higher electrical conductivity of Au-MWCNT/PANi-2 compared with the other samples (PANi, MWCNT/PANi, Au-MWCNT/PANi-1) is supported by the red shifts of the UV-vis bands (polaron/bipolaron), the high value of the -NH+= stretch peak (Fourier transform infrared spectroscopy studies), the high % crystallinity (X-ray diffraction analysis) and more uniform dispersion of the Au NPs in the material. The performance of the samples in electromagnetic interference (EMI) shielding and microwave absorption was studied in the X-band (8-12GHz). For all the samples, absorption was the dominant factor contributing toward the EMI shielding. Au-MWCNT/PANi-2 showed the best performance with a total shielding effectiveness of -16dB [averaged over the X-band (GHz)] and a minimum reflection loss of -56.5dB. The higher dielectric properties resulting from the heterogeneities because of the presence of nanofillers and the high electrical conductivity lead to the increased EMI shielding and microwave absorption. The results show the significance of both Au nanoparticles and method of synthesis on the EMI shielding performance of MWCNT/PANi composites. Copyright (c) 2016 John Wiley & Sons, Ltd.
机译：通过两种不同的方式合成导电的Au多壁碳纳米管/聚苯胺（Au-MWCNT / PANi）纳米复合材料：（1）通过直接混合MWCNT / PANi和Au纳米颗粒（Au-MWCNT / PANi-1）和（2） MWCNTs和Au纳米颗粒（Au-MWCNT / PANi-2）的存在下通过苯胺的原位聚合反应。与其他样品（PANi，MWCNT / PANi，Au-MWCNT / PANi-1）相比，Au-MWCNT / PANi-2的电导率更高，这归因于UV-vis波段（极化子/双极化子）的红移， -NH + =拉伸峰的高值（傅里叶变换红外光谱研究），高％结晶度（X射线衍射分析）和金纳米颗粒在材料中的更均匀分散。在X波段（8-12GHz）上研究了样品在电磁干扰（EMI）屏蔽和微波吸收方面的性能。对于所有样品，吸收是导致EMI屏蔽的主要因素。 Au-MWCNT / PANi-2表现出最佳性能，总屏蔽效果为-16dB（在X波段（GHz）上平均），最小反射损耗为-56.5dB。由于存在纳米填料和高电导率，由异质性导致的较高介电性能导致增加的EMI屏蔽和微波吸收。结果表明金纳米颗粒和合成方法对MWCNT / PANi复合材料的EMI屏蔽性能具有重要意义。版权所有（c）2016 John Wiley＆Sons，Ltd.

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